Medicare Part B Enrollment Timing Calculator
Plan Part B enrollment timing to avoid penalties and IRMAA.
Initial Enrollment Period
IEP Start:64.75
IEP End:Age 65.25
7-month window: 3 months before, birthday month, 3 months after turning 65.
Special Enrollment Period
SEP Available:Yes
SEP Duration:8 months after coverage ends
SEP available if covered by large employer group health plan based on current employment.
Part B Premium & IRMAA
Standard Premium:$ 174.70/mo
Your Premium:$ 174.70/mo
Annual:$ 2096
Income Threshold (Single):<$103,000
Income Threshold (Married):<$206,000
IRMAA based on income from 2 years prior. Standard premium: $174.70/month (2024).
Part B Costs
Deductible:$ 240
Coinsurance:20%
Annual Premium:$ 2096
After deductible, you pay 20% of Medicare-approved amounts for most services.
Late Enrollment Penalty
Penalty Applies:No
Penalty Rate:10%/year
Duration:Lifetime
Penalty = 10% of premium per 12-month period you could have had Part B but didn't. Penalty lasts forever.
Part B Enrollment Key Points
- Enroll during IEP to avoid lifetime penalty
- SEP available if covered by large employer plan
- SEP: 8 months after employment/coverage ends
- Late penalty: 10% per 12-month period, forever
- IRMAA may apply based on income (2 years prior)
- Delay Part B if SEP available and employer coverage active
- Part B premium: $174.70/month (2024 standard)
- Deductible: $240, then 20% coinsurance
- Coordinate Part B with employer coverage carefully